Chronometer and odometer



(No Model.)

' 2-Sheets;-Sheet 1. 1). HARRINGTON. GHRONOMBTER AND ODOMETER. No. 580,045. Patented Apr 6, 1897.

Inventor.

W itnes ses:

f ,Uffakn'rggan E WWTW Attorney5- (No Model.) 2 Sheets-Sheet 2.

D. HARRINGTON UHRONOMETER AND ODUMETER.

No. 580,045. Patented Apr. 6, 1897,

Witnesses: Inyentar.

AtLonneyS UNITED STATES PATENT OFFICE.

DAVID HARRINGTON, OF IVORCESTER, MASSACHUSETTS.

CHRONOMETER AND ODOMETER.

SPECIFICATION forming part of Letters Patent No. 580,045, dated April 6, 1897.

Application filed March 22, 1895. Serial No. 542,794. (No model.)

To all whom it may conccrnr.

Be it known that I, DAVID HARRINGTON, a citizen of the United States, residing at Worcester, in the county of Vorcester and State of Massachusetts, have invented a new and useful Improvement in Chronometers and Odometers, of which the following is a specification.

The aim of this invention is to improve the details of chronometers and odometers, and especially the details of combined chronometers and odometers.

The mechanisms herein shown, described, and claimed are improvements upon the mechanisms shown, described, and claimed in my application for patent filed September 21, 1894, Serial No. 523,693.

The aim of the improvements hereinafter recited is to lighten, simplify, and render more efiicient the parts necessarily used in devices of this character.

Referring to the two sheets of drawings accompanying this application and forming part thereof, Figure 1 is a plan view of my improved chronometer and odometer. Figs. 2, 3, and 4 are sectional plan views taken on the lines 2, 3, and 4, respectively, of Fig. 0. Fig. 5 is a sectional elevation. Fig. 6 is a central sectional elevation taken on the line 6 6 of Fig. 5; and Figs. '7, 8, and 9 illustrate details hereinafter referred to at length.

As shown and as hereinafter described, my improvements especially relate to a combined chronometer and odometer in which the hands are arranged in adjacent comparable relation. This mechanism may be put to various uses where it is desired to ascertain the number of revolutions of machinery or the number of revolutions of the wheels of a moving vehicle or the distance traveled and to compare the same with the time which elapses for said number of revolutions or distance traveled.

Referring to the details of the drawings, a represents a suitable casing which has a base or lower partition 6, a middle transverse partition c, an upper transverse partition 61, and a dial-plate e.

Arranged above the dial-plate, so as to protect the pointers or hands, is a glass plate f,

which may be held in place in the casing a by any of the usual retaining-springs, as g.

A chronometric train or spring-actuated system of gear-wheels is arranged in the device to act as the motor for moving the timehand. This consists of the winding-shaft h, which has arranged on the lower end thereof a key 2', and arranged on this shaft h is the usual spring-actuated gear-wheelj, which is connected to the shaft h by any of the ordinary pawl-andratchet or winding mechanisms, not necessary here to show or describe at any length, the whole constituting a winding-shaft such as is used in nearly every clockwork.

Driven from the gear j is a gear-train consisting of the gearing 10, 11, 12, and 13, by which the rotation of the shaft h is multiplied. Actuated from the gear 13 is an escapement-le ver 14, of any of the ordinary patterns, which is arranged to actuate a springcontrolled escapementor balance wheel 15.

J ournaled in the partitions in the center of the device is a shaft 19, which I call the main shaft, and mounted upon this shaft is a pinion 16, which is driven from the gear 110, which gear 110 is secured to turn with the gear 11 of the chronometric train. Mounted upon a barrel projecting from this pinion 16 is a heart-shaped or setting cam 17, which also has an extending barrel, as shown, upon which is mounted the seconds-hand 18.

The barrel of the cam frictionally fits on the barrel of the pinion, so that the two parts will normally turn together, but so that the cam maybe revolved on the barrel of the pinion. This construction is so arranged that the pinion 16 turns freely 011 the main shaft, so that the cam 17 and seconds-hand will ordinarily turn with the pinion 16, but so that the cam and seconds-hand may turn upon the barrel of the pinion to bring the seconds-hand to the zero position.

From the gear 110, by means of any of the usual clock-gearing 120 and 121, a clock or clock-hand may be actuated.

The seconds-hand 18, mounted on the main shaft, as before described, is arranged to pointto a graduated circle 7;, which is divided into one hundred and twentydivision s.

The gearing or chronometric train is so arranged that the hand 18 will make one revolution every two minutes or every one hundred and twenty seconds, and thus seconds may be read on the graduated circle 76.

The clock-hands or time-indicator are arranged to operate with the usual graduated circle m similar to that of a watch or clock.

Arranged on the lower partition or base I) are bearings 22, in which is mounted a wormshaft 23, which carries a worm 24. On the end of this worm-shaft 23 is mounted a pawlplate 142, which carries a spring-actuated pawl 143, which is adapted to engage a ratchetwheel 144, rigidly secured on the end of the worm-shaft. This pawl-plate is connected by any suitable means to a moving part of the machine or mechanism which it is desired to indicate, and through this pawl mechanism the worm-shaft 23 will be intermittently rotated. A friction-spring 27 is used to prevent backlash of this shaft 23.

Loosely mounted upon a stud 190, which is independent of the main shaft 19, but which is arranged in line therewith, is a worm-gear 28. The worm-gear 28 engages with and is operated by the worm 24. Formed with or carried by the worm-gear 28 is a friction-hub or one member of a friction-clutch 128.

Mounted on the shaft 19 and arranged to cooperate with this friction-hub is a frictionpad 29, which is keyed to the shaft 19, but so arranged that the same may have a sliding movement on said shaft. The use of this friction-clutch in this particular location is very advantageous, because no matter in what position the two parts constituting the clutch are when they are connected or disconnected they will have no effect on the hand 30that is, the connecting or disconnecting of the friction-clutch will not change the position in the least of the hand on the dialwhereas if a positive clutchthat is, a clutch hav ing teethis used there will be necessarily some slight movement between the two members thereof when they are connected and dis connected, and thereby a slight movement to the right or left of the hand on the dial. It will thus be seen that when the friction-clutch is disconnected all motion of the main shaft is stopped, and even then, if any moving part should stick, the hand would not be affected, as when the pad 29 is raised no movement can be communicated to the same. Thus a very accurate mechanism is provided.

Secured to the upper end of the shaft 19 is a hand or pointer30, which cooperates or indicates on a graduated circle 300, indicating the distance traveled or the number of movements made by the mechanism to which my device is applied.

The gearing in the particular instance is so arranged that if my device is applied to a safety-bicycle the hand 30 will make one complete revolution for each mile traveled, and the circle 300 maybe graduated into any desired fraction of a mile, as eighths, quarters, &c.. Also mounted on the shaft 19 is a single-toothed pinion 31, which meshes with a Geneva gear 32, mounted on a shaft 33, the proportion between the pinion and gear being in the specific device shown one to ten. On the top of the shaft 33 is arranged a hand 34, which cooperates with a graduated circle Z, and this hand 34 will thereby indicate the number of complete revolutions made by the hand 30. Mounted on the shaft 19 is a heart shaped cam 35, which is used, as hereinafter described, to bring the hand 30 to zero position. A push-rod 36 extends through the easing, as shown, and the same has a suitable spring 37, mounted on the same, so as to normally keep the push-rod in its outermost position. This push-rod extends into a bearing 38, fastened to the partition d, as shown, and extending from the push-rod is a yoke 39, which engages a pin 40, carried by a pawlplate 41, loosely mounted on a shaft 45. This pawl-plate carries a spring-actuated pawl 42, which is arranged to engage a ratchet-wheel 43, secured to said shaft 45. A catch 44 of the usual form is arranged to hold the ratchetwheel from accidental displacement.

Mounted on the shaft 45 is a two-toothed cam 46. Mounted on a short shaft 47 is a vibrating frame 48, which has a spring arranged, as shown, so as to keep the outer end of the same tightly pressed against the cam 46. Mounted in the end of the vibrating frame 48 is a sprin g-brake 50, which isadj usted to bear on the balance-wheel 15 to either start or stop the same. It will be seen that this springbrake 50 engages and disengages from the balance-wheel of the chronometric train with a wiping motion, so that when the brake is disengaged from the balance-wheel it will positively and accurately start the oscillation of the same. This is an. important point in practice, because by the use of this mechanism I'do not have to depend upon jolts or the tension of the springs in the chronometric train to start the cloekworkin operation. The use of the spring-brake constructed as shown is also very advantageous, because the same will bear for a considerable movement upon the balance-wheel. Also arranged on the shaft 45 is a setting-cam 51, which has two teeth 52 52, as shown. These teeth. bear on the back of a cam-arm 53, which is mounted on a barrel 54, loosely arranged on the shaft 33. Also mounted upon the upper end of this barrel 54 is a cam-arm 55, and these cam-arms 53 and 55 carry small rollers, as shown, which. bear upon the setting-cams, for the time and distance hands. The upper cam arm is adapted to engage the cam 17, and the lower cam-arm to engage the cam 35.

The ratchet-wheel 43 has six teeth, so that the device will operate as hereinafter described.

An important point in construction will be noticed here when it is stated that these two cam-arms are mounted upon a common barrel and are actuated from a single cam, thus IOC greatly simplifying the construction and ren dering extremely accurate the setting of the two hands.

The lower cam-arm 53 is split, as shown at 530, and this split arm has a tapped hole, screwed into which is a screw 531, having a tapered head.

The cam-arm is counter-bored, so that the conical head of the screw will fit into the same, the whole being so arranged that the arm may be spread to get an accurate operation on the cam 35. This is an important point in practice, because the cam-arm should be of exactly the proper length to tightly engage and bring the heart-shaped cam to one position, and by means of this adjustment wear can be compensated and extremely accurate regulation obtained. Also mounted 011 the shaft 45, below the cams previously referred to, is a cam 56, which has two high portions or teeth 57.

58 represents a spring-arm which is rigidly secured to the middle partition 0, as shown, and which straddles and engages the friction pad 29. The tendency of this spring-arm is to normally throw the friction-pad 29 into engagement with the hub 128. The spring-arm has a downwardly-extending projection 158, which engages the cam 56.

The operation of my device is as follows: Supposing the same to be placed in position in connection with the machine or device with which the same is to be used, so that the'shaf t will be intermittently turned. Starting with the hands in the Zero position, when it is desired to start my device in operation the rod 36 is pushedin. This by means of the ratchet mechanism will turn the shaft one-sixth of a revolution. The first sixth of a revolution of this shaft will cause the spring brake or wiper to wipe on the balance- Wheel 15 of the clockwork, and thus positively start the same in operation, and thus the hand 18 will commence to indicate seconds of time. At the same time the cam 56 will move, so that the spring 58 will throw the friction-pad 29 onto the friction-hub 12S, and thus the movements or work done will commence to be indicated by the hand 30. Now when it is desired to stop the device when the desired operation has been indicated the rod 36 is again pushed in. This will cause the brake 50 to engage the balance-wheel and stop the clockwork and will disengage the frictio111-clutch, thus stopping both the odometer and the chronometer and indicating exactly how many seconds the device has been in operation and indicating exactly what has been done by the device or mechanism to which my apparatus has been applied. Further, as these two mechanisms are arranged in adjacent comparable relation, the result can be easily ascertained. Also, it will be seen that when the parts are in operation the exact relation between the chronometer and odometer can be instantly ascertained. A third push on the rod will cause the cam-arms 53 and 55 to bear upon the cams 35 and 17 and will bring both hands 18 and 30 back to zero position. Thus an extremely light, eihcient, and durable mechanism is provided for the objects desired.

The clock-hands may be set, if desired, by means of a small button or knob on the lower end of the shaft The details, parts, an d arrangements herein described and claimed can be varied by a skilled mechanic without departing from the scope of my invention as expressed in the claims.

Having thus fully described my invention, what 1 claim, and desire to secure by Letters Patent of the United States, is

1. In a device of the class described, the combination of a main shaft, a distance-hand carried thereby, a driving-gear mounted in line with the main shaft, africtional connection between the main shaft and driving-gear, comprising a friction pad or part longitudinally movable upon the main shaft, a timehand, a chronometric train therefor, and a starting and stopping mechanism connected to move the friction-pad into and out of engagement with the driving-gear and to simultaneously start and stop the chronometric train, substantially as described.

2. The combination in a combined chronometer and odometer of a ehronometricallyactuated hand, a distance or revolution hand, and means for actuating the same, and setting mechanism for both hands, comprisinga cam for each hand, an arm actuating each cam, said arms being connected or mounted to move together, a single cam for actuating said arms, adj ustin mechanism between said single cam and said arms, and means for actuating said single cam, substantially as described.

3. The combination of a time-hand, a distance 0r revolution hand, means for operating the distance-hand, a chronometric train for operating said time-hand, and a starting and stopping mechanism for both hands, adapted to start the chronometric train positively in action, and, at the same time, to start the distance-han d in operation, substantially as described.

4. The combination in a combined chronometer and odometer of a time-hand, a distance or revolution hand, means for operating the distance-hand, a chronometric train for operating said time-hand, and a starting and stopping mechanism for both hands, arranged to positively start the chronometric train in action, and, at the same time, to start the distance-hand in operation and to positi vely stop both hands, substantially as described.

5. The combination in a combined chronometer and odometer of a time-hand and a distance or revolution hand, a chronometric train for operating the time-hand, and gearing for operating the distance-hand, a starting and stopping mechanism for said hands comprising a push-rod, a ratchet mechanism operated from said push-rod, cams operated from said ratchet mechanism, one having connections to positively start and stop the chronometric train, and the other to start and stop the operation of the distance-hand, substantially as described.

' 6. The combination in a combined chronometer and odometer of a time-hand, a distance or revolution hand, a chron ometric train for operating said time-hand, means for operating said distance-hanchand a starting, stopping and set-ting mechanism for said hands, comprising a push-rod, a ratchet mechanism operated from said push-rod, and three cams operated from said ratchet mechanism, connections from one of said cams to positively start and stop the chronometric train, connections from the second of said cams to start erating said heart-shaped cam, said arm being split and provided with an adj ustingscrew, and a cam for operating said arm, sub stantially as described.

In testimony whereof I havehereunto set my hand in the presence of two subscribing Witnesses.

DAVID HARRINGTON. Witnesses:

LOUIS W. SOUTHGATE, PHILIP W. SOUTHGATE. 

